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Engine misfiring

Tiny
BENJIOBENJI
  • MEMBER
  • 1982 FORD F-150
  • 15,800 MILES
Hello, I have an 82 F150 4x4 i6 300ci. I have replaced plugs, wires, dist cap, rotor, pcv, rebuilt carb, engine runs a lot better, but still has a little miss, and sometimes idles down to 500rpm, I adjust f/a mix, and idle speed screw, and then revs to 1100rp

what up?
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Wednesday, November 23rd, 2011 AT 2:57 AM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Since you did all those repairs and assuming it is all correct, you need to check the compression first to verify the motor is good. Beyond that, you may have a vacuum leak.
Roy
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Wednesday, November 23rd, 2011 AT 3:19 AM
Tiny
BENJIOBENJI
  • MEMBER
  • 1 POST
Could a bad vac advance cause a miss?
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Wednesday, November 23rd, 2011 AT 4:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Only if the timing is way over advanced.

Roy
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Wednesday, November 23rd, 2011 AT 4:29 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
BURNT VALVE?

COMPRESSION TEST EARLIER MAY SHOW IT

THE MEDIC
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Wednesday, November 23rd, 2011 AT 4:50 AM

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